Remove server route matcher stack

[timneutkens]

What?

Remove the legacy server route matcher managers, route matcher providers, and server route matcher classes. Move route definition and params metadata into fsChecker output and request metadata instead.

Why?

The filesystem checker already owns the normalized route lookup path in production. Keeping a separate matcher manager stack duplicates route inventory, adds reload plumbing, and makes dev and production behavior harder to keep aligned.

How?

• Build pages and app route definitions in fsChecker from production manifests and from the dev route inventory.
• Thread matched route definitions and params through resolve-routes and router-server request metadata into base-server and next-server.
• Remove reloadMatchers propagation and delete the legacy matcher manager, provider, and matcher implementations and tests.
• Preserve dev ensurePage behavior, including legacy custom-server render methods, and Pages API loading by using matched route definitions while loading compiled dev modules where needed.

Verification

• pnpm test-start-webpack test/e2e/custom-routes/custom-routes.test.ts
• pnpm test-start-turbo test/e2e/custom-routes/custom-routes.test.ts
• pnpm test-dev-webpack test/e2e/custom-routes/custom-routes.test.ts
• pnpm test-dev-turbo test/e2e/custom-routes/custom-routes.test.ts
• pnpm test-dev-webpack test/e2e/on-request-error/dynamic-routes/dynamic-routes.test.ts
• pnpm test-dev-turbo test/e2e/on-request-error/dynamic-routes/dynamic-routes.test.ts
• pnpm test-start-webpack test/e2e/app-dir/app-routes/app-custom-routes.test.ts
• pnpm test-start-webpack test/e2e/app-dir/edge-route-rewrite/edge-route-rewrite.test.ts
• pnpm test-start-webpack test/e2e/middleware-rewrites/test/index.test.ts
• pnpm test-start-webpack test/e2e/middleware-matcher/index.test.ts test/e2e/middleware-custom-matchers-basepath/test/index.test.ts test/e2e/app-dir/rewrites-redirects/rewrites-redirects.test.ts
• pnpm test-start-webpack test/e2e/api-catch-all/api-catch-all.test.ts test/e2e/basepath-root-catch-all/basepath-root-catch-all.test.ts test/production/root-catchall-cache/root-catchall-cache.test.ts
• pnpm test-start-webpack test/e2e/i18n-beforefiles-rewrite/i18n-beforefiles-rewrite.test.ts
• pnpm test-start-webpack test/e2e/basepath/redirect-and-rewrite.test.ts
• pnpm test-dev-webpack test/e2e/custom-server/custom-server.test.ts
• pnpm test-start-webpack test/e2e/custom-server/custom-server.test.ts
• pnpm --filter=next types
• pnpm --filter=next build
• git diff --check

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